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Applied Sciences
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Microbiology in Paddy Soil
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Microbiology in Paddy Soil

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Green Sustainable Science and Technology".

Deadline for manuscript submissions: 20 October 2024 | Viewed by 3065

Special Issue Editor

Dr. Chuan Chen

E-Mail Website
Guest Editor
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Interests: anaerobes; arsenic; biogeochemical cycle

Special Issue Information

Dear Colleagues,

We are inviting submissions for the Special Issue on Microbiology in Paddy Soil.

Rice is the most stable food for more than 50% of the world's population. Globally, paddy fields for rice production cover almost 150 million, constituting the largest anthropogenic wetlands on earth. The depletion of oxygen and other electron acceptors upon flooding results in a decrease in redox potential that proliferates microbial activities directing the redox reactions in paddy soils, such as aerobic respiration, denitrification, ferric iron/arsenate/sulfate reduction, methanogens, etc. The highly complex microbiology mediates the biogeochemical processes in paddy soil and is closely related to rice security and global climate change.

The Special Issue aims to present fundamental research exploring the ecological processes and mechanisms by which microbial groups interact with each other and with the paddy environment, including microbial diversity and interaction, elemental biogeochemistry, and coupling among different processes. The Issue will focus on identifying the functional microbes and the underlying mechanisms involved in different biogeochemical processes, such as arsenic or mercury transformation, methane production and anaerobic oxidation, denitrification, and sulfate reduction. We hope this Issue will improve our insights into the Microbiology in Paddy Soil.

Kind Regards,

Dr. Chuan Chen
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • paddy soil
  • microorganisms
  • biogeochemical processes
  • arsenic
  • methane
  • denitrification

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Published Papers (1 paper)

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Research

10 pages, 1544 KiB  
Article
Active Nitrogen Fixation by Iron-Reducing Bacteria in Rice Paddy Soil and Its Further Enhancement by Iron Application
by Zhengcheng Zhang, Yoko Masuda, Zhenxing Xu, Yutaka Shiratori, Hirotomo Ohba and Keishi Senoo
Appl. Sci. 2023, 13(14), 8156; https://doi.org/10.3390/app13148156 - 13 Jul 2023
Cited by 2 | Viewed by 2614
Abstract
In rice paddy soil, biological nitrogen fixation is important for sustaining soil nitrogen fertility and rice growth. Anaeromyxobacter and Geobacteriaceae, iron-reducing bacteria belonging to Deltaproteobacteria, are newly discovered nitrogen-fixing bacteria dominant in paddy soils. They utilize acetate, a straw-derived major carbon compound [...] Read more.
In rice paddy soil, biological nitrogen fixation is important for sustaining soil nitrogen fertility and rice growth. Anaeromyxobacter and Geobacteriaceae, iron-reducing bacteria belonging to Deltaproteobacteria, are newly discovered nitrogen-fixing bacteria dominant in paddy soils. They utilize acetate, a straw-derived major carbon compound in paddy soil, as a carbon and energy source, and ferric iron compounds as electron acceptors for anaerobic respiration. In our previous paddy field experiments, a significant increase in soil nitrogen-fixing activity was observed after the application of iron powder to straw-returned paddy field soil. In addition, combining iron application with 60–80% of the conventional nitrogen fertilizer rate could maintain rice yields similar to those with the conventional nitrogen fertilization rate. It was thus suggested that iron application to paddy soil increased the amount of nitrogen fixed in the soil by enhancing nitrogen fixation by diazotrophic iron-reducing bacteria. The present study was conducted to directly verify this suggestion by 15N-IRMS analysis combined with 15N-DNA-stable isotope probing of iron-applied and no-iron-applied plot soils in an experimental paddy field. In no-iron-applied native paddy soil, atmospheric 15N2 was incorporated into the soil by biological nitrogen fixation, in which diazotrophic iron-reducing bacteria were the most active drivers of nitrogen fixation. In iron-applied paddy soil, the amount of 15N incorporated into the soil was significantly higher due to enhanced biological nitrogen fixation, especially via diazotrophic iron-reducing bacteria, the most active drivers of nitrogen fixation in the soil. Thus, our previous suggestion was verified. This study provided a novel picture of active nitrogen-fixing microorganisms dominated by diazotrophic iron-reducing bacteria in paddy soil, and directly proved the effectiveness of iron application to enhance their nitrogen fixation and increase the incorporation of atmospheric nitrogen into soil. The enhancement of biological nitrogen fixation in paddy fields by iron application may lead to novel and unique paddy soil management strategies to increase soil nitrogen fertility and ensure rice yields with reduced nitrogen fertilizer input and lower environmental nitrogen burdens. Full article
(This article belongs to the Special Issue Microbiology in Paddy Soil)
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